/* 头部 */
header{
    background-color: white;
    #contentWrap{
        position: relative; 
        margin: 0 auto;
        width: 1100px;
        height: 80px;
        
        /* logo */
        #logoWrap{
            float: left;
            margin-top: 30px;
        }
        #music{
            float: left;
            background: url(../img/musicon.gif);
            width:14px; 
            height:14px; 
            margin:50px 0 0 5px;
        }
        /* 右边导航 */
        #navWrap{
            margin-top: 50px;
            float: right;
            .navList{
                float: left;
                position: relative;
                margin-left: 40px;
                &:hover .up{
                    width: 100%;
                }
                .up{
                    position: absolute;
                    width: 0px;
                    color: #000000;
                    overflow: hidden;
                    transition: .5s width;
                }
            }
        }
        /* 右边小箭头 */
        #arrow{
            width: 21px; 
            height: 11px;
            position: absolute; 
            z-index: 1;
            top: 80px; 
            left: 50%;
            background: url(../img/menuIndicator.png);
            transition: .5s left;
        }
    }    
}
